Here it says what are all possible values for L when n = 4. All right, so remember when N is given, L = 0 up to n - 1. Since N is 4, that means that's 4 -, 1. So that's three.
Three is not your answer though, because we just said L = 0 up to N -1. So L would equal 0 up to three, which means that when L when N is 4L can equals 0, 1-2 or three, meaning that option D is our correct answer.
